Floyd Mayweather Jr. Wins $42.5K Betting Underdog Dmitry Bivol to Beat Canelo Alvarez

Floyd Mayweather Jr. made eight figures while handing Canelo Alvarez the first loss of his career in 2013.

Alvarez's second loss also came with a financial windfall for Mayweather, who made $42,500 betting on Dmitry Bivol's upset victory Saturday night. Mayweather placed a $10,000 moneyline wager on Bivol, who entered the prizefight a +425 underdog.

Bivol dominated throughout the fight on his way to a unanimous-decision victory. While the scorecards read an identical 115-113 from all three judges, most observers felt Bivol's victory was more dominant than the final scores indicated.

"I don't feel like I lost the fight," Alvarez said afterward. " ... Personally, I felt he only won four or five rounds. ... Maybe the weight was a slight issue and made me feel less than 100 percent. ... We want the rematch, and we're going to do better in the rematch.

"Tonight, I was looking for greatness. I have many years ahead of me, and I'm going to come back stronger."

Alvarez says he plans on exercising a clause that grants him a rematch, which will likely delay the anticipated matchup between Canelo and Gennady Golovkin. The two fighters were slated for a September bout to finish off their trilogy, but it's likely Alvarez will focus on a Bivol rematch first.

As for Mayweather, he's no stranger to putting in massive wagers. In fact, the $10,000 wager he put on Bivol was a bit small for his typical taste.

Perhaps Mayweather is becoming a little more discerning at the sportsbook in retirement.